Bump solidity version

contracts/tec/contracts/src/MixinSignatureValidator.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 
 import "@0x/contract-utils/contracts/src/LibBytes.sol";
 

contracts/tec/contracts/src/MixinTECApprovalVerifier.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 pragma experimental "ABIEncoderV2";
 
 import "@0x/contracts-exchange-libs/contracts/src/LibExchangeSelectors.sol";

contracts/tec/contracts/src/MixinTECCore.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 pragma experimental "ABIEncoderV2";
 
 import "./libs/LibZeroExTransaction.sol";

contracts/tec/contracts/src/TEC.sol

@@ -16,7 +16,8 @@
 
 */
 
-pragma solidity 0.5.2;
+pragma solidity 0.5.3;
+pragma experimental "ABIEncoderV2";
 
 import "./libs/LibConstants.sol";
 import "./MixinTECApprovalVerifier.sol";

contracts/tec/contracts/src/interfaces/IExchange.sol

@@ -15,7 +15,7 @@
   limitations under the License.
 
 */
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 
 
 contract IExchange {

contracts/tec/contracts/src/interfaces/ITECCore.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 pragma experimental "ABIEncoderV2";
 
 import "../libs/LibZeroExTransaction.sol";

contracts/tec/contracts/src/libs/LibConstants.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 
 import "../interfaces/IExchange.sol";
 

contracts/tec/contracts/src/libs/LibEIP712Domain.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 
 
 contract LibEIP712Domain {

contracts/tec/contracts/src/libs/LibTECApproval.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 
 import "./LibEIP712Domain.sol";
 

contracts/tec/contracts/src/libs/LibZeroExTransaction.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 
 import "./LibEIP712Domain.sol";
 

contracts/tec/contracts/src/mixins/MSignatureValidator.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 
 
 contract MSignatureValidator {

contracts/tec/contracts/src/mixins/MTECApprovalVerifier.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 pragma experimental "ABIEncoderV2";
 
 import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";

contracts/tec/contracts/test/TestInternals.sol

@@ -0,0 +1,121 @@
+/*
+
+  Copyright 2018 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.3;
+pragma experimental "ABIEncoderV2";
+
+import "../src/MixinSignatureValidator.sol";
+import "../src/MixinTECApprovalVerifier.sol";
+
+
+contract TestInternals is
+    MixinSignatureValidator,
+    MixinTECApprovalVerifier
+{
+    /// @dev Recovers the address of a signer given a hash and signature.
+    /// @param hash Any 32 byte hash.
+    /// @param signature Proof that the hash has been signed by signer.
+    function publicGetSignerAddress(bytes32 hash, bytes memory signature)
+        public
+        pure
+        returns (address signerAddress)
+    {
+        signerAddress = getSignerAddress(hash, signature);
+        return signerAddress;
+    }
+
+    /// @dev Validates that the 0x transaction has been approved by all of the feeRecipients
+    ///      that correspond to each order in the transaction's Exchange calldata.
+    /// @param transaction 0x transaction containing salt, signerAddress, and data.
+    /// @param transactionSignature Proof that the transaction has been signed by the signer.
+    /// @param approvalExpirationTimeSeconds Array of expiration times in seconds for which each corresponding approval signature expires.
+    /// @param approvalSignatures Array of signatures that correspond to the feeRecipients of each order in the transaction's Exchange calldata.
+    function publicAssertValidTECApproval(
+        LibZeroExTransaction.ZeroExTransaction memory transaction,
+        bytes memory transactionSignature,
+        uint256[] memory approvalExpirationTimeSeconds,
+        bytes[] memory approvalSignatures
+    )
+        public
+        view
+        returns (bool)
+    {
+        assertValidTECApproval(
+            transaction,
+            transactionSignature,
+            approvalExpirationTimeSeconds,
+            approvalSignatures
+        );
+        return true;
+    }
+
+
+    /// @dev Validates that the feeRecipient of a single order has approved a 0x transaction.
+    /// @param order Order struct containing order specifications.
+    /// @param transactionHash EIP712 hash of the 0x transaction.
+    /// @param transactionSignature Proof that the transaction has been signed by the signer.
+    /// @param approvalExpirationTimeSeconds Expiration times in seconds for which the approval signature expires.
+    /// @param approvalSignature Signatures that corresponds to the feeRecipient of the order.
+    function publicAssertValidSingleOrderApproval(
+        LibOrder.Order memory order,
+        bytes32 transactionHash,
+        bytes memory transactionSignature,
+        uint256 approvalExpirationTimeSeconds,
+        bytes memory approvalSignature
+    )
+        public
+        view
+        returns (bool)
+    {
+        assertValidSingleOrderApproval(
+            order,
+            transactionHash,
+            transactionSignature,
+            approvalExpirationTimeSeconds,
+            approvalSignature
+        );
+        return true;
+    }
+
+    /// @dev Validates that the feeRecipient of a single order has approved a 0x transaction.
+    /// @param orders Array of order structs containing order specifications.
+    /// @param transactionHash EIP712 hash of the 0x transaction.
+    /// @param transactionSignature Proof that the transaction has been signed by the signer.
+    /// @param approvalExpirationTimeSeconds Array of expiration times in seconds for which each corresponding approval signature expires.
+    /// @param approvalSignatures Array of signatures that correspond to the feeRecipients of each order.
+    function publicAssertValidBatchOrderApproval(
+        LibOrder.Order[] memory orders,
+        bytes32 transactionHash,
+        bytes memory transactionSignature,
+        uint256[] memory approvalExpirationTimeSeconds,
+        bytes[] memory approvalSignatures
+    )
+        public
+        view
+        returns (bool)
+    {
+        assertValidBatchOrderApproval(
+            orders,
+            transactionHash,
+            transactionSignature,
+            approvalExpirationTimeSeconds,
+            approvalSignatures
+        );
+        return true;
+    }
+}

contracts/tec/contracts/test/TestLibs.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.3;
 pragma experimental "ABIEncoderV2";
 
 import "../src/libs/LibTECApproval.sol";